The ecological risk assessment of pesticides is generally based on toxicity data obtained from single-species laboratory experiments and does not take into account ecological interactions such as competition or predation. Intraspecific and interspecific competition are expected to result in additional stress and might increase the sensitivity of aquatic populations to pesticide contamination. T...

Both theory and experiments have demonstrated that sex can facilitate adaptation, potentially yielding a group-level advantage to sex. However, it is unclear whether this process can help solve the more difficult problem of the maintenance of sex within populations. Using experimental populations of the facultatively sexual rotifer Brachionus calyciflorus, we show that rates of sex evolve to hi...

Heterogeneity among prey in their susceptibility to predation is a potentially important stabilizer of predator-prey interactions, reducing the magnitude of population oscillations and enhancing total prey population abundance. When microevolutionary responses of prey populations occur at time scales comparable to population dynamics, adaptive responses in prey defense can, in theory, stabilize...

Puerto Viejo es un humedal costero de importancia para aves residentes y migratorias conformado por varios cuerpos agua estacionales, naturales artificiales con altas salinidades. Este ecosistema se encuentra ubicada al sur Lima, Perú. En junio 2004 llevaron a cabo censos la biodiversidad abundancia comunidad invertebrados, representando diferentes en 28 estaciones muestreo litorales distribuid...